<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
		var b=["英国","阳朔","王凯旋","庞志豪"];
		b["clsName"]="java76";
		b["startDate"]="2021-10-11";
		alert(b.length);//4
		alert(b["clsName"])
		alert(b.join("%"));
		
		</script>
	</head>
	<body>
	</body>
</html>
